Abstract:  Aiming at the problems of large vibration quality, poor moisture performance and low work efficiency of traditional planar two-dimensional vibrating screen, a new hydraulic vibration mode which could generate controllable multi-point excitation and multi-degree of freedom vibration in pipe network was proposed. A hydraulic vibration testing system based on pipe network excitation was developed. The simulation model based on AMESim was established. The effect of set pressure of relief valve, reversing frequency of rotary valve on excitation pressure and amplitude of piston rod were studied. Then, vibration test of the hydraulic excitation system was carried out by using displacement sensor, signal conditioner and data acquisition card, the vibration signal was filtered and smoothed. The results indicate that the excitation pressure increases with the rising system pressure, but decreases with the descent of the valve reversing frequency. Besides, the amplitude of piston rod increases with the rising system pressure but decreases with the descent of the valve reversing frequency. The measured vibration curves basically coincide with the simulation curves, which reveals the coupling relationship among the reversing frequency of the rotary valve, the system pressure, and the cylinder amplitude; indicates the controllability of the hydraulic excitation parameters; demonstrates the feasibility of exciting the pipe network to generate multi-point excitation and multi-degree-of-freedom vibration. The pipe network hydraulic excitation system model based on AMESim can truly reveal the dynamic characteristics of the system, which provides a new way for the design and analysis of the hydraulic excitation system.

Key words:  AMESim;hydraulic excitation system;dynamic characteristics;pipe network